feat: add support for vxrail cluster shutdown API

[garlicNova]

Summary

Added Invoke-Vxrailclustershutdown cmdlet to support cluster shutdown via VxRail Manager Rest API call. The results are the same as using the vSphere UI and right-clicking on cluster, selecting VxRail, and VxRail cluster shutdown.

The workload domain script has implemented this to support VCF 5.0 deployed on VxRail.

Type

• [ ] Bugfix
• [X] Enhancement or Feature
• [ ] Code Style or Formatting
• [ ] Documentation
• [ ] Refactoring
• [ ] Chore
• [ ] Other Please describe:

Breaking Changes?

• [ ] Yes, there are breaking changes.
• [X] No, there are no breaking changes.

Test and Documentation

• [X] Tests have been completed.
• [X] Documentation has been added or updated.

Issue References

Closes #17

Additional Information

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